Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a3c7f71fd6f0997d8bf357edc57160072849919d4fc57d193edb92e3c3cf7c' 
  AND token = 'yu4DU8URdMd0W6BqAO+uTZE/qcdCHQxqTvuw2rJeiO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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