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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '60731ca15166d1e34b2992f35bae66a163ee21cec32a2935a00daae33be9aa05' 
  AND token = 'SW5oLv/Knw1S5I7+zmRrfRUBSIat3sF7XhFmti3xDDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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