Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b7f96a983a04b3de9dc38b88aee43e2a326e58c2d7f56d60dca5c8ad72412a' 
  AND token = 'qS8uqMk/nCbV3XpD1wiIKKL8K4Ql6gHCzPzTi+8B47g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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