Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81849f0cfd3f96add7df39283d36e8ec036ac1c7be29a2231f529e729b37fc60' 
  AND token = '40ZSLpuSJfVnfA69079hBVWiGkfan+mzYN/YGfLRDCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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