Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d8d5aabfde319b082586fc703105f935f75e1ed5764269c362939cdbad93c5' 
  AND token = 'XfmlSSfkSYtUvG1FrZsszE0LCvftaXqwGTg4Ynp2ueI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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