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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be525e4366725796a20d9abf0dae330dd8ff61a6bf93841e345da1d414f4c1df' 
  AND token = 'IrLklaaV1NC0skeXUoq5cQ/mwdI4W6954aU64rXLHU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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