SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '660151f27325900d8b9ffbf9c7bd72d545f4006c959ea1886052c0a2d345a742' 
  AND token = 'wYtsLcRtIIPe3A/Yvw8f1Z6QulrJzFD93AGxTUpNwgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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