Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6b9374cad41d1d6c9afedd8185f6055c21cdae0329645cfcd2b2001c2441aa' 
  AND token = 'Np6Z/8KADLtXFuwYa3IpM6pWfk3lHQHi9UhxTeex4Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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