Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0c502fa2ccbcd7ad9ae6e8044cc9b56fcc366ee18d305598e015a34ceabaf8' 
  AND token = 'PHQ3zlXJXKLvWKz9vr2HG0vp7FpcaHHJ0Hg2PApa+KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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