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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4867a74b37c54a473f7255ab6cd0453b82096500e37f90d9b73a7e387e1dd6ef' 
  AND token = '/sESM2thpyRZ07aEpFf70pDJbjiHqRlFxDOn/ua24tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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