Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dda027177d87c9a44ab35cd5c672e29e1e04e4d36120aa1dfa93c43c8140391' 
  AND token = 'tIy5Gj1hT6iNIL3r+5+MeIxoHDQK/YvpR9vyTajUdlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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