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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dcb0a8e9071d7b8fd7596667ffecabcc241597e0a2ca1cfa21911eac834a618f' 
  AND token = 'IXxDPqbFFhME0ckDuhMck87yrhKYtSaaietoBd+XgaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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