Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fdb515616dfdb79dd095885364350f7be72df4f2dbe81f45b18de11490a9870' 
  AND token = 'dkX73/QtPL5SD9hewD8MEYHskkfBe+EIUPjBijyt6A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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