Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd655890ca508ef1c54250ef30dc2b634dd2423b955a2c9e7242d72efaef07426' 
  AND token = '5c9i0d9+R7RzXAqWIF0gWy2yF1s/j2Ui4G+MojYsaGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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