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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9dd828f17549694046674fa3ee5b53e7969271154899f0f53947467e477573c4' 
  AND token = 'wIZ2x3o+jJwg+owdQM6R37+d3U/UO9XIO1bYBjbs074=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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