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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27621d773628f93554ff0a6956c5892da6be8abc3aa36dc58e8241c0556e8a7c' 
  AND token = 'VfAYZ+d2wRiHgfeFS79r1+sC8Oc3Vk/VJur0ydHe0VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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