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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ad04aaf0d001c0f8d9b0777eb7707a620abb53210cd57188d31967be2d13d0c1' 
  AND token = '+3MmiUpYoJ2MYT/ucO6kyduSsdR6uxx2EUZzY++kFP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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