Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8035c6eb0bb8c4e5fbe51e6551d1ca2d3d0d94d1c71e8e4a96a494a2acda4562' 
  AND token = 'I7z38cqANvsg9r7CAzaRZyT88e7esABjSpOLwEMmFpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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