Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4238a6dfe29a5bfc537e2baf7743854f0ebbdd1a64ae476deec2dcfbd19e41e9' 
  AND token = 'HzpUgE5Lopi6P8O2vo6t+qGlgqkFb/QY4eEvnXbeVVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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