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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c4e030af07b8500c5d3acc1faa41e1547b60e4a8f1eabd756f77b450195ea4a' 
  AND token = '44Q2Ic8VMLh/jYqadzGYUVo05kTb7QhTO79SmTMNrfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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