Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819f3fdee753676d41e685fa94efca734d56c94677af5d50c973d6bd55c43ac6' 
  AND token = 'eIUFFXQHX25mkqyczNHROE6l0qDt0rPOPE7QnW0TH6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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