Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9bf9d82604e97ea3e6ece9c7f9daaec0b8e1784a71ca5a8f7400fe573a9a75' 
  AND token = 'YJ1UTOL+rRC66VqlkHlpa0dUcDTykil8ND/JTLJQVKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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