Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4010baae4ee8468179c348e990fa50d11496e6fe85b862e228490d478ad622a6' 
  AND token = 'RmxoZdMmjksfPOy1CUzBbLYgMZXtzF3i9vzyladbiQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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