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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd50c63e41d439e167eea47e253da2b0dcf78402c17c3255bd6597b2bdfd72529' 
  AND token = 'qIbeOnNVOwdbwqYoBR/8qa3e/mUc4HgI1WHe6jpsDaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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