Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced5373336af559ec9e13aca6e6801e8e78d00d3b6d895bdb9c6b49713aaecfe' 
  AND token = 'jyR//+4MWBGEiWijTvcs3Ynjy1OUC5jXOQ/1wWxN8m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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