Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3b76800811bacaa8dde13e0359119b919ed32beb157d24c6d5fa0921d228c5' 
  AND token = 'MuRASDLs+hF8hT4QlWf1dX4eVET7dJMXQ72YkR9agCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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