Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864dff311c1f11135d36cd64ce2d4816448e12b29afeb6b172d428cf7c1999c7' 
  AND token = '/b4wRQ74776aN8Svj1V7PjQEzP5bCsta/gX3RFGqPJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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