Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0a3505f1e08795f85caa1c7b1d290c4d5aefb6d93098b8d8c4e41eaaca15ca' 
  AND token = 'P7EaoQu4oFiJ4fO2OVZ2zloQuJCUI7vI8+p+9AbEKTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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