Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5f4cbaa92dcc21cb8d67f7dca1ed342bfe07c3bacd1faae0e7faaf75df316d' 
  AND token = 'KU0a+OMqOkVdnOc4hEH3c+73I4bR+rjel+HZ3oEkFAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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