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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'abaacd453e1f5da81229c1d8a3105c88c8e49e9f71cd98de1621516f8612c56e' 
  AND token = 'NWb/hP4SvR/ezp+XMp1vkuc5chlXPuQSQ1/8vc0XM9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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