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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4f042afed5b4b5ec044b007348b17ec523ca71e92138ed50486bb8adc1737d09' 
  AND token = 'RfByvOewXdOQpTsXNfxH6vT1oGA4y8TqqS6yoN8oXr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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