Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17639dc5f94fc01391e657282f6f0a611353216b87e8b21dfb45e4201cfbb778' 
  AND token = 'X6KW94l3hwRQjIc0Kt7x3xVxLoCtMujdo00GA+RSc8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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