Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76dce98988ee4458acb16b0d10b2e7c731f1a4c41859fd7185297a186fda1c39' 
  AND token = 'q0/MGhmdg7QbuL2Z3s2T7RfAnFVCg65+gNoXj4N7IHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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