Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f05e26a2fffb3e5d776a815c8021786513065563bdaa51709cd58a49e7e443' 
  AND token = 'JpzsWM5LqdLKe2VflTqbfqNAQc1S96WivFEFtFA8nzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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