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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4f28eb6dc6f310a82e11a616cb7fa6cca600445b8fc8fa5ce5cadde688e3f71d' 
  AND token = 'Piwko80+zsiJp24YgDxm5qb/S3JasaR4y0ER6Ycpa5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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