Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15b7850ec47663598978bec20ae1e75183b08d8ec09390030f4bfb0a91260e7' 
  AND token = '8CGMDGhoIsQrmP1HU5FHGmoIqdLK9bviYfKqm4AEBBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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