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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0aa997590a340bb7e930396cef42f89800b8faa45c29ce62389ac8621b41d848' 
  AND token = 'S+nWU+VtgQtQtYeakPLwncIcykbQZCsb0457jh0vGDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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