Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9a0840d1935b378be37022a65bc7f32e32cfa5d75aecb4074f3d37a27be7e8' 
  AND token = 'FAmuGxpxj29b2zzeIBzB2QFhmm5znuovHK+8SFFJJNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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