Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908174ca23aa19e1b4fad6b4cccf6d8d29b3f9ebe2f160415bd447341fe4d183' 
  AND token = 'jmMYhxHeiR6tafPLEguDQmRoLxRYYJHURmxgKasQ5cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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