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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cf137f0c9517353e87fa58e767e6ce5382ed465b1e5e113e844fa5d3f9c2fbac' 
  AND token = 'oa/HVXercJ8TuD2adszmI8Rm86Msec9qtzxQAANSEoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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