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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '41651906ee5be3d6a497008cf30a00368399d5ab060d6d45f6df4c55c5f8188d' 
  AND token = 'ITbVu/7rOuyK5LFGk6HdSR7V29vozcRpe1ybsbcpmWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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