Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b99e892583b8d81fb3b033303f1e8946a5a47fe9103b7703c6739e25384f842' 
  AND token = 'dzMt/P2g9xVfSzUAtROOLXWhwzkAkKsfROvZmSP+i+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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