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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cdaeb14cb5936d328a93cc8a790ddcb03569de2ad2ad9e8ba33b7b2be527d70d' 
  AND token = '5zRHrYqLTZ8n+R4EUdVAqXbjhoDZXCwSrIENr5ua+MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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