Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2dffe89f2e90ca50eba374ef77c93e3cfee741fe71d7d7fa04b0e4fd5361ed' 
  AND token = 'LXJcnc1J4snLc+izqQ+d7P7rfWRM0jolphT0mKpK1yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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