Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba49347d86bcdeabea410b41cf677b1c4aca2a7553d5d69cf449abad10ccb75' 
  AND token = '16SCIey+RVxwYOkaxptodNMaO4fwYYvCt56EzQxnSZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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