Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4c6b0786e05d703395736fbb4fba9c39284e6935204353e520e3de0e856172' 
  AND token = 'Q7rqHK3LfwRda4EffuMmpP5IibSmtZMfZh7lznEVa8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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