Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e40a2c602b0318f933fcaf97a5610860378a692c6a0af904eba9801ef60d36c4' 
  AND token = 'SmdocV47FLC8Z8oKCjuFlIauM6rswVYBXduQZSi5te0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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