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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '10afbafc6b7a982fe708fd3c0ad1a8bdda41a7f73f71c4b4f48f72704a682f87' 
  AND token = 'DxIGiXfy876DpVU3hOS9hoQujWWw5LLPv+6la29p1VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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