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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bbf7f0ac5820a378063ac23ce65041dde35729de3f4c737141c27f861ee93370' 
  AND token = 'moISUeI/SEFgY6+ZE43w3kxbMEZdP7jIPlOd4fPAN4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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