Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fdc984f008c8f5ce6cce1d48ec6489c7874c923404664cf4d2d443d58fb5be' 
  AND token = '9kn711K7H2T8a2FUporEc2hIkxCG9keND4TkRTFvCfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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