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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4edf15b8bf1274f16979983dea415d9ad33cc976579f261a284be670c0674ed5' 
  AND token = 'Wo/sRnjF9a/8nhTA5VybITC6Sd0CDDZV+pPzyy4v8Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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