SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '20285471063609b7161f524298a814cc0293ac6e90fbd188ce4fe15d3be944f8' 
  AND token = 'EQTetWrCAFCUTqPZV+eSxKzGP2qX5J7v/A4Gbq4Bc0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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