Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6936c4b8c55915fdccb38daa5c24c93979510b4289cfd8c00779e89fbeae2d91' 
  AND token = '0lpJx0r3dNALFYd6A3pqkpBrvbbhL/w2TOFj25tpB+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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