Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e936310a3186158632200b467b6af1a2f3ffb1489d32aaa0b4228f07a0112cad' 
  AND token = 'rRAEceqSUsCT1XKvyS8c6trpCzVD2NlOWjQXbVy/v1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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