Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd761a50e426816b2ae3a015e989523ee593245bdabe31f2b80593a9096a68b6f' 
  AND token = '6Vih/euOm5ZX+dfgGcHtxafS2lfJMb3cpkE++lzfvz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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