Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e4dedfe4117f4f9cb341aeabf1f6edf754b5b080981629d1e61fc87b254a7c' 
  AND token = '78T0aosilnXZx1XAFy+VOyq9KE/1Q6fuf5SzAduiEPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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