Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e38d8ee60cb2678a79704871081a657541a0d4fd7958a0ea45bd40a225e16e' 
  AND token = 'P6ZRtpR/OleUSSjG/PHze8v2vMvFJgAnCCeN/U+eqhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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