Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a309a82e1f8005b780bd6ed309b3aa3240175403b554191264794968a78fd40' 
  AND token = '41iQHxN2GWFVYHef0ccJey/Um4pZj+UP0pNMj9d2ofs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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