Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d85284222e6276955c5e483ab2d6c291d73995eb6f4f4f982c9eca4ebae63c' 
  AND token = '8W7sX1uD3vWkKS7k+S0C5UHt/CX+kmlFkQbMRHJGMaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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