Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5d236d74982102de9239c8474db4a482f39e14e75cf8f9710a4ebb6ab607af' 
  AND token = 'yzTq8X98j9oRezSn712VFRZeFIuezFChlkmFj6xA/nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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