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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '05d4052fb5e2000a90903f5cc9eb3e33aefb4fe4fd9262e1a69d6e946be2de30' 
  AND token = 'MGN9oa/eIEUU+4JlMqGLfq46qOymanrq4aigAMoPGm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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