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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '724298f462976e47a7eaf6b7fe1e7ca8bec6977c3de89069bce88b0098558388' 
  AND token = 'ffNNz0kcc8P5kwz+4PFRKfVUtEHwDmsV6pPrCeL/l9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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