Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0796c1be0be4a56037d7b13e6d3edc060339a3aba0a0dac09a031e3f87422e9' 
  AND token = 'Mgm0w7zW6beJWCC8bXX5kHKvVim+kxxYqjsPtTTpfxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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