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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '06511b8deeff14727f98ad7cab3afeff2d20e04fe71476d8cdcf85c91dc2d47c' 
  AND token = 'o8vf9YJrQTqinMz2/wkKZb+yTaw7W3Iupfrczowpj5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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