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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'db86a300e7be431c833929469f86854538ca41d36e0db97bbdef2b21e65d8a91' 
  AND token = 'y8OgbNyKJW0gpxIPGx2AiJJxZ9y3gXdI/v71edtcJl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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