Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6ffcca21252a008aea9e9bea2942c28d42cade17f3fc1bfd8b177dc6711a57' 
  AND token = '3Nrl5iqVhpZSws8h41av8ZEtouICPgQ8GUrT9taQnHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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