SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7305df433ffe1b8d57f84b0439248d19cdb80cba58b3757c1fd134f1c0f5fbde' 
  AND token = '/66W/YgqAPlCn+YxfiYHU74h91cdpZphiP6Q9CUQ2fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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