Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc210708a7297906e19ad887794fb20f8ba2597bc1c280eae57f79cb7323b09a' 
  AND token = 'i0QoWHdiHAGK7gdjhOdNt0NARtotz75peaYFhHNp0yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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