Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a0c0f8ab218fbc8202eab76f903f7eacc2cc0c076881a6a51de6c6d366ac66' 
  AND token = 'yNc1BBgT5RjXiXsyomJwnfIpSJl94qXJ9FOv+8PhoFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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