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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1557ea0868925010816a5bee7ee7bc0bcee342f047e3e0be5efd5aebc7fa68db' 
  AND token = '8CdcxGIXj9DI6Cu/FWOECGnoLJmTkC4vZJ/CjORN8iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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