Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8d91c4b929eb75c2e8d6eb76b6230acbdcfcc32b4ea028f44bb8741b42b11e' 
  AND token = 'xubYdp48qgXp6fOqJasxx1MzdUvPj8e6NgxSzJvWabs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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