SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '38cf5e015d3ce378247505a3df691e5888f78a3b026581fe3ee027527ec60f39' 
  AND token = '8sNxQJBkGly2Q2STkUQbs+a5Lvls4Yg6mWVChBKjly8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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