Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393741ef96f150fa29c1a28528df3ea519729d04d45049d821c0f9d492a7c000' 
  AND token = 'XPtdl8rB1c2ixyWZUcEHG05bIf2IiQTW8dt4UjCMk+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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