Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd638da200285862d9dfd04775054e774226f7ac1e160a8ff4595a60d609a16' 
  AND token = 'h6/cT4/kBwXcOBf+AVXwFk9aM4+rfpLMNRpv63bU50k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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