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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8efb459a4ca62c96ca0bfe668b8d9b6a38815a71d227582c20c7fe95f6da521d' 
  AND token = 'Bqn17UMjWngFoB0mvT5drbQuH3rcgiTSSrr0FAMSQzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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