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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98a696e38dad61b69d19869c15d55a89adde11427c42ce85cf6b17229ef5ea9c' 
  AND token = 'a2+pV15STjiAsIVtEQSRmo7kEsR+zLVdBHN5UVdg6kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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