Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a520a19fe1f44a72faf30f2649a6507aa49cb5542a26b064b0b44ea18d41cde' 
  AND token = 'QdZWkdo+tZbc8kBw0VWXjzHVObReQXTtd/jzmPMOP00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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