Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef71c9ca64f0e94dc66fa89a1d336aa27cca2f9a4548199cfa8d8ccf0092efc7' 
  AND token = 'qHaSw0tLnDZ43qAzLLsMyeYjUGfr6oV0f0wjbanZ6Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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