Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c00e3e2567cdbba09d8fdb14da3461155e0e76e9dfb3eb46fada04e0b9f7ff' 
  AND token = 't7W6Ua8y9P+5dUVPeBkBFyVTO3GwWA1eSaLa9G4gHUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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