Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5f775e6cf3c382c12ce8f2683057f805ebbe66029398287c72577cbb3690bf' 
  AND token = '2iowEKY9u6QfHoJ5rDvuhlgmctKdKuC1oF+UKRTEVx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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