Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75d68a005c3bd6f0cece4dc85af76ccd9f4097fb78f6f7a57c7f2a04ee83039' 
  AND token = 'pacJt62cmkBwr5yjzi6kBEZnuxXvkTGWR8sO3eOhAfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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