Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2158b322fe21a03dbd3b43bff30cdad457fe799ff638167dc5b83b85e69981' 
  AND token = 'MZXKemT4QN4SbPNEMmxwKgXUXj5Q9AlQ5wkkdj0f0uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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