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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27d96b73ba8c4c648b9a3d00d8fcddaccd9081817ab25d1ad28896c51f8a5a2b' 
  AND token = 'ewqih2PX/o6P1cAh5oiVXRrCAMc7xgLGtRRRg7IyUI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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