Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6158ef38c398302682b224eec46df6fe41af09c9b3fb29499b34c05800f8016' 
  AND token = 'sAmaQITozdVR3GA/Isyp9VbFAiMq7i+zMQdtaF2d890=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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