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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3637a76c3fd3cf568f373f0e36f2bc7a2dc0e70c8377bfae5b654aed81a6ec0a' 
  AND token = 'G8FWWCtHojxfCu1ofm9793NfHnrEpttBeLqfzh6gjqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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