Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b40bb3e488b301f8198ac17206773bbe1af88a27803bea8359e78820439ff12' 
  AND token = 'tBuRdlIHwH2IQTOoCQjkggEYVyoxie2qEEYfOrd+khY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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