Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4a1f8703f9bbee69accf65edd1c20ac335af9ba1c0e725e0e105a273bfb225' 
  AND token = 'zIIT9+IMRCiTtr9YaYmyDzMMOeAGjVPZgZ65wDlvHPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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