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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6ccf8de1cf90d6fc411e89700ba0e89616fc5fd2e161d9f3c3e4467dcd57d328' 
  AND token = 'vvHuO3OvSUg1ziiQ1H9CwPI8C+Y09WEYbjcwIqmNz50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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