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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd96ee58d95bdb0eb48f9de60cfbcdd2f51e19ea697a923cca859d031aba65a3b' 
  AND token = 'ed3k5jX+76pAb4iRQZTh0tW85Ip500Dtnb6m27nXXTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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