Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128bdd57a2b4e0cf5a3b0dcfa48a0535de241ed6d7c64c0d10fff01bd7f0d136' 
  AND token = 'LM0WdPaivfoAbeuLhmgpWCoxoj9dpAKkMyMM0P6Wmxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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