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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '46f8c1f39c1fdec2637b6620fd7e0f08dfba624f0270278bfb25293d82df09f7' 
  AND token = '5wDj5SsAG+GylD3zQk3k7zt5L8sb00pqfq0lzTMvdog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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