Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee5f129f9fa08dcdb23b773541e5bc4e3e4f1b2e98ffd752004401a668cbb79' 
  AND token = 'u/d5wLCTyLyWdwuJXv60D9RqcfRq7HZQKI1Y0wFnyd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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