Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19aa72733ebd122bab9ae856a5888859cf3068b88a4a0a2bf560c2ca7beed51' 
  AND token = 'wkDHrVHUroN91OqUeTXpfh9CwrLPc5UqxILlniqcMa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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