Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b5f9b5a7b25e9786e1640528ce3b7c3c01b58069796e2d349b0fa50c89945fc' 
  AND token = 'ZyVx5pNE77pH+i9TOPoI3pIcRmix8Ql69CyqWg4vmNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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