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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98acbbdd1a88c9fe306999fef77b18f4b09e40724358a4ca9cf762c2ef6943b0' 
  AND token = 'TkzixEN65H0sne6je5MadDVISu3PeWNl9Q/zW2ZJbQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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