Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b52a6a71ff8998637bc31cc3c1e247dd6ddc743bb1062870800756d7f3a285' 
  AND token = 'tImUCfBrtegsobCi3/7VvFrbBW9r0qgquCDKHsIuNUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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