Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71636da070885c228a926e2bd67e36b4ad5d7bc3e39cdf4b45b7caff1bc74d1' 
  AND token = '3+GuAd0A8N4WxP2nuUt9mkkZlBe9UMrTsfUYsfPCTkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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