Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b917f9ac2b4fbba6a82a0d9cb45dfdc005c6626af46dbf8bf413afec47eeaaca' 
  AND token = 'txhvp2nPzH34W0EuLd2aKXlxkvl1V7MvMN2fEbvvPRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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