Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f992098b3f9ea3dfcce014975688b508c67126f20db2ad00aacc7d48bc1c29d' 
  AND token = 'hFa351wYsIT46xcQk7sJoaRazYyHg8vv+iJAUvbZM+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}